Auth Component Logout renews Session

public function logout() {
-------------------------
 $this->Session->renew();
----------------------------

 }

See Above code at AuthComponent::logout, my question is why it renews the session on logout.

Problem Case:
When user open a page with Auth login/logout in incognito browser window. Then upon logout there will always be a orphan session entry in cake_sessions table or an unused file in /tmp/sessions/.

Is this OK ?

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